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r @einen tutes gianni @fitte CLARKSQN F. JQHNSON, OF EAST SAGINAW,MICHIGAN.

Letters Patent No. 71,494, dated November 26, 1867; antedaed November15, 1867.

IMPROVEMENT IN IH MANUFACTURE 0F SALT.

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TO ALL WI-IOM Il MAY CONCERN: p p

Bc it known that I, CLARKSON F. JOHNSON, of East Saginaw, in the countyof Saginaw, and State of Michigan, have invented a new and usefulImprovement in the Manufacture ot' Salt by the Chapin .Paten't",Process;

and I do hereby declare-that the following is'a full, clear, and exactdescription of the construction and Operation of the same, referencebeing had to t-he annexed drawings, making a part of this specica'tiomin whichh- Figure 1 represents a top view of the Chapin patent process,with my improvement attached.

Figure 2 represents a transverse section off the vat, &c., back of thefire-box, with my improved vat-bottom.`

Figure 3 represents a view of the front end ofthe vat. A l

The nature and character of my invention consist in increasing themanufacture of salt-"in the Chapin patcnt process, and constructing a4narrow pan or trough, A, or its equivalent, for carrying the-brine inthc most heated route from the boiling-box B, in front, back through thesmoke-.stack C, and emptying into the rearend of the lower body ofbrine, D, so as to ca usc the movement of the loweebody of brine theother way to the front end, or most heated part of the vat, therebyequalizing the temperature of the entire brine, so as to make salt morerapidly, and making large openings, E, in the front end of thecrystallizing-pan bottom F, on` either side of the boiling-box B, so asto continue the same flow without a pressureupwards on the pan-bottom F,thcreby'preventing thc unsettled or lower body of brine from leakingthrough` or getting on the crystallizingpan-F until it gets thoroughlysettled, and Hows forward and up through the large openings E in thefront end of the crystallizingpan F.

My invention further consists in constructing a vat-bottom in the wayand manner set forth in the drawings, l l foi` the purpose of having thesame amount of heat and same evaporating surface as before in a lessbody of l brine, vthereby getting the brine hotter and making salt morerapidly.

I do nottclaim any of the useful combinations of Mr. Nathan Chapin, orother inventors, or theii` separate i i devices; but what I do claim asmy invention, and desire 'toi secure by Letters Patent, is

1. Constructing a narrow pajh or trough A, or its equivalent, forcarrying the brine `in the most heated,V route from the boiling-box` B,in front, back through the smokestack C, and emptying it into the rearend of p the unsettled or lower body of brine, D. p I i 2. I claimmaking large openings, E, in the front end of the crystallizing-p'an F,and on either side of the boiling-box B, to prevent the ipressure upwardand leakage of the unsettled or lower body of brine on theerystallizing-pan F. l

3. I claim constructing a vat-bottom in the way and manner set forth inthe drawings.

CLARKSON F.` JOHNSON.

` Witnesses: t i

FEED. A. ASHLEY, D. R. ALLINe'roN.

